The Stronger singer is with the final weeks of being pregnant with her second child with husband Brandon Blackstock, who boasts two kids coming from a previous relationship.

And, as music star Kelly prepares for that birth with their baby boy, she admits this is the last time she's checking the pregnancy process considering that the journey is not an easy one on her behalf.

"Oh, no, were done," the pop star told Australia's KIIS FM radio station. "Oh good Lord, yes, I can't be pregnant again. This will be our # 4 total, so we're good... Honestly, reduce costs was really rough, and I was like, 'Oh, it cannot happen again,' with no, it happened, like, way worse now."

The singer's illness am bad to begin with that she was required to receive regular IV drips caused by her extreme dehydration.

British royal Catherine, Duchess of Cambridge, suffered precisely the same condition when she was pregnant with both her children, Prince George and Princess Charlotte, and even was required to cancel a string of royal engagements caused by its intensity.

"It's 100 times worse than morning sickness," Kelly added. "I just get hospitalised, and I ensure fluids. It's just, like, my body system was not designed to be pregnant. I wish I was such as girl that... 'It's beautiful', but it is not."

Kelly and Brandon, who wed in 2013, welcomed daughter River Rose in 2014.